Oscillation generator for sieves, troughs, and like apparatus



Feb. 7, 1933. G LINKE 1,896,712 v OSCILLATION GENERTOR FOR SIEVES, TROUGHS, AND LIKE APPARATUS Fil July 22, 1931 2 Sheets-Sheet l will,

Patented 7, 193 3 GERHARD LINKE, O1? IAGDEBUBG, GERMANY, ASSIGNOR TO THE FIB}; FRIED. 1mm

GBUSONWERK AKTIENGI'BELLSCHAFI', OF IAGDEBURG-BUCKAU, 01mm osonma'rron Gamma-r03 ro'n'smvns, rno'oorrs, Am Lnm Arrm'ros Application filed July 88, 1931, Serial Io. 858,588, and in Germany July 11, 1980.

This invention relates to apparatus for producing oscillations or vibrations in reciprocating plants of all kinds, and in particular for sieves, troughs and like appliances 5 for sorting, conveying and preparing materials. The vibrationgenerator is provided with two balance weights, whichhave different directions of rotation but the same angular velocity so that the balance weights operate in the same direction in relation to each other at two diametrically opposed points and in opposite directions at two points at right angles to the first mentioned points. Due to this arrangement, little or no centrifugal action of the balance weights arises, so that a continuously changing and strong stressing of the means carryin the oscillating part of the apparatus, sue for example as supporting springs or suspensory pendulums, in a direction at ri ht angles to the plane of vibration is avoided. In the vibration generators hitherto known the centrifugal forces can only act upon each other indirectly through the driving and bearing parts of the balance weights. Thus the alternate accumulation and removal of the centrifugal forces during .working takes gllace through the medium of such parts wh-ic in consequence, are subjected to unusually great stresses and therefore must be made correspondingly strong. The chief object of the invention is to eliminate this disadvantage.

According to the invention one balance weight is so mounted as to be independent of t e shaft carryin the a paratus and acts either as a rolling ody'd irectly or by the agency of rolling bodies upon that part of the apparatus carrying the other alance weight.

The accompanying drawings represent four examples of the invention as applied to means for driving a sieve. r

Figures 1, 3, 5 and 7 are in each-case a vertical section of the driving gear, and

Figures 2, 4, 6 and -8 are in each case a section corresponding to the lines A-B, CD, E-F and G-H of Figs. 1, 3, 5 and 7, respectively.

In the a paratus according to Figures 1 50 and 2, in t e frame of the sieve 1 there is '8 fashioned as a roller.

non-rotatably mounted a shaft 2, u on which s rotatably pivoted a housing 3. .l'he housng 3 serves as a pulley and is provided at its inner wall with a balance weight 4. At the centre of the shaft 2 and within the housmg, is pivoted a bifurcated guide arm 5, which is raised by means of a counter-weight 5'. In radially directed slots 6 in the arm 5 is guided the axle 7 of a balance weight The roller 8 rolls duringworking 'in a eri heral path 9 formed by an internal rib of the housing 3. The guide arm 5. is driven from the housing 3 by means of bevel wheels 10, 11 and 12. The bevel wheel 10 is fastened to the housing 3 and transmits its rotation throu h the bevel wheel 11 mounted upon the fixe shaft 2 to the bevel wheel 12 connected with the guide arm 5. The bevel wheels 10 and 12 are of uniform size. 'The guide arm 5 consequentto: 1 turns in a direction op osite to that of l t e housin 3, but with t e same an ular velocit he drivin of the device is 'effected y means of a It 13 running u on the external rocking of t e' device in undesired directions is precluded by the fact that the centers of gravity of the weights 4 and 8 operate in a common plane.

In the position of thebalan'ce weights 4 9aand 8 shown in full lines '(Fig. 1), they lie in the same direction, namely in the direction of the arrow 9:. Upon further rotation of the housin 3 to the extent of in the direction 0 the arrow the balance weight 4' 88a gasses into the position shown in dot and ash lines in the lower art of Figure 1 while the guide arm 5 turns in the direction of the arrow 3 and consequently brings the balance weight 8 into the position opposed to the balance weight 4 as s own in dot and dash lines in the upper part of Figure 1. Inthis I position with simllar dimensioning of the.

alance weights the centrifugal forces become annulled: If the balance weights be turned to the extent of a further 90 then they both work in the same direction, namely in the direction of the arrow 2. If turned by a further 90 the balance weights again work in opposite directions and so on.

eriphery of the housin 3. he 7i Dne to the fact that with this drive one halance weight, namely the roller 8, acts directly upon the carrier, and the other balance wei, t t acts upon the housing 3 those parts which carry the roller 8 are either entirely free from the effect of the centrifugal force or they are stressed in a far more favourable manner than has hitherto been usually the case. Thus in the present case the guide arm and its bearings remain entirely unafiected by the centrifugal force of the roller 8; consequently the centrifugal force also does not attack, as heretofore, the bearing point of the arm carryin one of the balance weights. that is to say, t e centre of the shaft 2 but the action of the centrifugal force of both weighs is taken up by the bearings of the housing 3, which bearings lie directly contiguous to the shaft hearings in the sieve "frame, so that, therefore, practically no bending momentum at all is exerted upon the shaft 2. Owing to the elimination of the centrifugal force moments from the hearing and driving parts 1 ing in the housing 3 an easy running, free rom interference, of the apparatus is ensured. The entire drivin mechanism may also be made weaker er li liter in construction than has heretofore een the case.

In the example according to Figures 3 and 4, within the circular path or rib 14 of the housing 15 is mounted a crown of rollers l? carried by a cage or annular frame 16. "iUpon the cage 16 is mounted a balance eight 18, which is provided with a recess,

for example a hole 19, in which rests one arm 20 of a drivin member 21. The other arm 22 of the driving member serves merely for balancing the arm 20. In other respectsthe type of construction represented coincides that according to Figures 1 and 2. Due to the use of a complete crown of rollers, an extended and secure bearing for the inner balance weight is obtained. Furthermore with this constructional form, the bevel wheel connected with the driving member can be moved towards the middle so that, consequently, either more space is obtained for the bevel Wheel gear or the housing can be kept smaller.

this example the centrifugal force ct "Feet of the balance wheel 18 is taken up by he rolier axes 23. The roller axes must conequently be made very strong and be well lubricated. Should this cause difficulties they can be avoided by means of the construcional form oif apparatus shown in Figures 5 .md 6. in this example a crown of rollers 24 is also disposed within the circular pathof the housing, said crown of rollers being carried by a cage 25. This constructional term differs from that accordin to Figures "3, 4 in particular due to the act that no special balance weight carried by the roller is present as with too previous construction,

but a. similar object is obtained due to the fact that the crown of rollers at one part of its periphery has a larger number of rollers. Owing to t e direct contact of the rollers with the circular path, the roller axes are free of the effects of centrifugal force.

The driving member 26 has two arms 27 and 28 which engage with the roller cage 25, through the agency of pins 29. These pins 29 lie in radial slots 30 so that any movement of the crown of rollers caused by the centritngal force action or by any play between the crown of rollers and the circular path, can take place without influencing the driving member and the shaft.

igures 7 and 8 show a further exam le. Instead of the rollers balls 36 are providiad which run between the circular path 31 oi the housing 32 and a ball race 33 formed in the disc 35 carrying the inner balance weight 34. Whereas in the preceding constructional examples the guide arm and the driving member are so 'ournalled upon their shafts that an axial displacement-of the arts rotating in the housing is preventeciz in the constructional example according to Figures 7 and 8 this journalling is superfluous because any axial pressure is taken up by the balls. The disc 35 is mounted upon the shaft with a certain amount of play.

This pe of construction which, moreover, coincides with that p'reviousl described has the advantage that wit the abolition of the bearing all the difiiculties attending the lubrication of this hearing are obviated. Between the housing 32 and the disc 35 an independent ball hearing may also be provided, so that in the case of wear and tear neither the housing nor the disc will be effected but only the exchange of the ball hearing will be necessary.

Instead of the rollers or balls use could be made of other devices, such as barrel-shaped rolling bodies, which also take up the axial pressure.

Other constructional forms are also possible, bearing in mind that it is essential that the arrangement should be so carried out that the effects of the centrifugal force developed by both balance wei hts are taken up by one common part, in w ich the efiects are negatived, annulled or accumulated.

The subject matter of the invention is intended to find use especially in preparator work; it is also however, to be used with ad vantage in connection with all reciprocating apparatus, for example in connection with apparatus for packing loose material.

What I claim is:

1. In combination with reciprocating apparatus, of a vibration generator comprising a shaft fixed to said reciprocating apparatus, a hollow cylindrical housing rotatably mounted upon said shaft, a balance weight fixed to said housing at the interior thereof,

means for rotating said housing, a second balance wei ht rotatably mounted upon said shaft in the inerior of said housing, a bevel gear assembly intermediate said housin and said second balance weight whereby sai lastmentioned weight is rotated by said housing and maintained in definite relationship with said first balance weight upon said housing, said rotation imparted to said second balance weight being of the same angular vel0city and in an opposed direction with respect to that of said first balance weight.

2. In combination with reciprocating apparatus, of a vibration generator comprising a shaft fixed to said reciprocating apparatus, a hollow cylindrical housing rotatably mounted upon said shaft, a balance weight fixed to said housing at the interior thereof, means for rotating said housing, an arm rotatably mounted upon said shaft in the interior of said housing, a roller serving as a second balance weight at the extremity of said arm, a circumferential rib at the interior of said housing for guiding said roller, bevel gears of the same diameter connected coaxially with said shaft to said housing and said arm, a coupling gear intermediate said bevel gears, said balance weights being so arranged that upon rotation of said housing th said weights rotate in oposite directions at the same angular velocity, with said weights extending in the same direction at two diain the line of vibrating in a line perpendicular to ment.

3. In combination with reciprocating apparatus, of a vibration generator comprising a shaft fixed to said reclprocating apparatus, a hollow cylindrical housing rotatably mounted upon said shaft, a fixed to said housing at means for rotating said arm rotatably mounted said line of movethe interior thereof housing, a bifurcated upon said shaft in the interior of said housing, grooves in the extremities of the branches" of said bifurcated arm, weightdiskposed in said grooves, a circumferentialri at the interior of said housing for guiding said roller, bevel gears of the same diameter connected coaxiallywith said shaft to said housing and said arm, a coupling gear intermediate said bevel gears,

of said housing said rection at two diametrically opposed points in the line of vibrating movement, and in opposite directions in a line perpendicular to said line of movement.

4. In combination with reciprocating apparatus, of a vibration enerator comprising a shaft fixed to sai reciprocating apparatus, a hollow cylindrical housing rotatof said housing, a roller serving movement, and in opposite directions 7 balance weight a roller serving as a-second balance f said balance" weights being so arranged that upon rotation ably mounted upon said shaft, a balance weight fixedto said housing at the interior thereof, a flexible transmission member'embracing the exterior of said housing for imparting rotation thereto, a guide arm rotatably mounted upon said shaft in the interior balance weight at the extremity of said arm, transmission former for coupling said balance weights in a predetermined relationship, whereby the rotation of said housing effects a rotation of said weights in opposite directions at the same angular velocity, withsaid weights extending in the same direction at two diametrically opposed points in the line of vibrating movement, and in opposite directions in a line perpendicular to said line'of movement. i i 4 5. In combination with reciprocating a paratus, of a. vibration generator comprising a shaft fixed to said reciprocating apparatus, a hollow cylindrical housing rotatably mounted upon said balance weight fixed to said housing at the interior thereof, means for rotating said housing, an annular frame rotatably mounted upon said shaft in e interior of said housing, a lurality of bearing rollers mounted in said rame, a circumferential rib at the interior of said housing for guiding said rollers,

to said housing coplmg gear intermediate sai bevel gears;

he combination claimed in claim 5 said last-mentioned coupling means comprises an arm loosely connected to said annular frame by a pin and slot connection, a bevel gear rigidly fixed to said arm, a second vel gear fixed to said housing coaxially with said first bevel gear and a coupling gear intermediate said bevel gears. 8. In combination with reciprocating apparatus, of a vibration generator comprising a shaft fixed to said reciprocating ratus, a hollow cylindrical mounted upon said shaft, 11 lance weight fixed to said housing at the interior thereof, means for rotating said housing, an annular as a second gearing intermediate said hous- P .7 housing rotatagly mounted upon said shaft the interior 0 bearing rollers mounted in said frame, a

circumferential rib at the interior of said housing for guidin said rollers, said rollers being unequally istributed around said frame whereby a closely disposed group of said rollers constitute a second balance weight, and coupling means between said housing and said annular frame whereby the rotation of said housing effects a rotation of said balance weights in o posite directions at the same angular ve ocity, with said weights extending in the same direction at two diametrically opposed points in the line of vibrating movement, an in opposite directions in a line perpendicular to said line of movement.

9. In combination with reciprocating apparatus, of a vibration generator comprising a shaft fixed to said reciprocating apparatus, a hollow cylindrical housin rotatably mounted upon said shaft, a be ance weight fixed to said housing at the interior thereof, means for rotatin said housing, a disc in the interior of sai housing concentricto the latter mounted for rotation about said shaft, a second balance weight fixed to said disc, a rolling bearing intermediate the internal periphery of said housing and the external psriphery of said disc, and coupling means tween said housing and said disc whereby the rotation of said housing effects a rotation of said balance weights in opposite directions at the same angular velocity, wi said weights extending in the same direction at two diametrically opposed points in the line of vibrating movement, and in opposite directions in a line perpendicular to saidline of movement.

10. In combination with reciprocating aparatus, of a vibration generator comprising a shaft fixed to said reci rocating apparatus, a hollow cylindrical ousing rotatably mounted upon said shaft, a balance weight fixed to said housing at the interior thereof, means for rotating said housing, a disc in the interior of said housing mounted with play upon said shaft, a second balance weight fixed to said disc, a rolling bearing intermediate the internal peri hery of said housing and the external rip cry of said disc, and coupling means tween said disc whereby the rotation of said housing effects a rota tion of said balance weights in opposite directions at the same angular velocity, with said weights extending in the same direction at two diametrically opposed points in the line of vibrating movement, and in opposite directions in a line perpendicular to said line of movement.

11. In combination-with reciprocating apparatus, of a vibration generator comprising a shaft, 9. balance weight rotatably mounted upon said shaft, means for rotating said balance weight, a second balance weight rotatably mounted upon said shaft in cooperative relationship with said first balance weight so that the loci of the centers of gravity of said weights are in a common plane, and means for rotating said second balance weight by the rotation of said first balance weight at the same angular velocity and in a direction opposite to the direction of rotation of the latter, said balance weights extending in the same direction at two diametrically opposed points in the line of vibrating movement, and in opposite directions in a line perpendicular to said line of movement.

The foregoin s cification si ed at Berlin, Germany, t is th day of J u y, 1931.

v GERHARD LINKE. 

